[CMake] Fix pthread handling for out-of-tree builds

LLVM defines `PTHREAD_LIB` which is used by AddLLVM.cmake and various projects
to correctly link the threading library when needed. Unfortunately
`PTHREAD_LIB` is defined by LLVM's `config-ix.cmake` file which isn't installed
and therefore can't be used when configuring out-of-tree builds. This causes
such builds to fail since `pthread` isn't being correctly linked.

This patch attempts to fix that problem by renaming and exporting
`LLVM_PTHREAD_LIB` as part of`LLVMConfig.cmake`. I renamed `PTHREAD_LIB`
because It seemed likely to cause collisions with downstream users of
`LLVMConfig.cmake`.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294690 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 50bcc508a8024448f9d46a60974a52f4bceec0ba..6bd2b535500e16f792c37a643c72fc82d59f3da9 100755 (executable)
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -115,7 +115,7 @@ if(HAVE_LIBPTHREAD)
   set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
   set(THREADS_HAVE_PTHREAD_ARG Off)
   find_package(Threads REQUIRED)
-  set(PTHREAD_LIB ${CMAKE_THREAD_LIBS_INIT})
+  set(LLVM_PTHREAD_LIB ${CMAKE_THREAD_LIBS_INIT})
 endif()
 
 # Don't look for these libraries on Windows. Also don't look for them if we're

diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index b3c7746c480ade18bbd1f688ca5f323711fc00aa..cb4171c9bc8825a1c8ef88a812c42d27d2d0cb3a 100644 (file)
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -718,11 +718,11 @@ macro(add_llvm_executable name)
   if(NOT ARG_IGNORE_EXTERNALIZE_DEBUGINFO)
     llvm_externalize_debuginfo(${name})
   endif()
-  if (PTHREAD_LIB)
+  if (LLVM_PTHREAD_LIB)
     # libpthreads overrides some standard library symbols, so main
     # executable must be linked with it in order to provide consistent
     # API for all shared libaries loaded by this executable.
-    target_link_libraries(${name} ${PTHREAD_LIB})
+    target_link_libraries(${name} ${LLVM_PTHREAD_LIB})
   endif()
 endmacro(add_llvm_executable name)
 
@@ -1027,7 +1027,7 @@ function(add_unittest test_suite test_name)
   # libpthreads overrides some standard library symbols, so main
   # executable must be linked with it in order to provide consistent
   # API for all shared libaries loaded by this executable.
-  target_link_libraries(${test_name} gtest_main gtest ${PTHREAD_LIB})
+  target_link_libraries(${test_name} gtest_main gtest ${LLVM_PTHREAD_LIB})
 
   add_dependencies(${test_suite} ${test_name})
   get_target_property(test_suite_folder ${test_suite} FOLDER)

diff --git a/cmake/modules/LLVMConfig.cmake.in b/cmake/modules/LLVMConfig.cmake.in
index 2aea2dcaa542eba0a68eb3d39321c58822442e6a..7a8eb3674720adf05dabca3ba05774d6c05f9b18 100644 (file)
--- a/cmake/modules/LLVMConfig.cmake.in
+++ b/cmake/modules/LLVMConfig.cmake.in
@@ -45,6 +45,10 @@ set(LLVM_ENABLE_PIC @LLVM_ENABLE_PIC@)
 
 set(LLVM_BUILD_32_BITS @LLVM_BUILD_32_BITS@)
 
+if (NOT "@LLVM_PTHREAD_LIB@" STREQUAL "")
+  set(LLVM_PTHREAD_LIB "@LLVM_PTHREAD_LIB@")
+endif()
+
 set(LLVM_ENABLE_PLUGINS @LLVM_ENABLE_PLUGINS@)
 set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS @LLVM_EXPORT_SYMBOLS_FOR_PLUGINS@)
 set(LLVM_PLUGIN_EXT @LLVM_PLUGIN_EXT@)

diff --git a/examples/ParallelJIT/CMakeLists.txt b/examples/ParallelJIT/CMakeLists.txt
index e85b470f5036b8c5b9ade0b707e8b5cdd79475f0..deeee072b33caa3896a10b9550d1bb8ad1875979 100644 (file)
--- a/examples/ParallelJIT/CMakeLists.txt
+++ b/examples/ParallelJIT/CMakeLists.txt
@@ -11,4 +11,4 @@ add_llvm_example(ParallelJIT
   ParallelJIT.cpp
   )
 
-target_link_libraries(ParallelJIT ${PTHREAD_LIB})
+target_link_libraries(ParallelJIT ${LLVM_PTHREAD_LIB})

diff --git a/lib/CodeGen/CMakeLists.txt b/lib/CodeGen/CMakeLists.txt
index a1e5fd46610ef7a75d8bdf58b25a22b1dec7ddf3..a9a3d85f3c26b38cd0c9c392f2611ae235b2ed85 100644 (file)
--- a/lib/CodeGen/CMakeLists.txt
+++ b/lib/CodeGen/CMakeLists.txt
@@ -150,7 +150,7 @@ add_llvm_library(LLVMCodeGen
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/CodeGen
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/CodeGen/PBQP
 
-  LINK_LIBS ${PTHREAD_LIB}
+  LINK_LIBS ${LLVM_PTHREAD_LIB}
 
   DEPENDS
   intrinsics_gen

diff --git a/lib/ExecutionEngine/IntelJITEvents/CMakeLists.txt b/lib/ExecutionEngine/IntelJITEvents/CMakeLists.txt
index 3b8c4b973e689dbc4eb8d25216c689af4e6a4869..e6c33b2ecc2a06b4d0ae0645cbae8c1ac42cc1d4 100644 (file)
--- a/lib/ExecutionEngine/IntelJITEvents/CMakeLists.txt
+++ b/lib/ExecutionEngine/IntelJITEvents/CMakeLists.txt
@@ -4,7 +4,7 @@ if( HAVE_LIBDL )
     set(LLVM_INTEL_JIT_LIBS ${CMAKE_DL_LIBS})
 endif()
 
-set(LLVM_INTEL_JIT_LIBS ${PTHREAD_LIB} ${LLVM_INTEL_JIT_LIBS})
+set(LLVM_INTEL_JIT_LIBS ${LLVM_PTHREAD_LIB} ${LLVM_INTEL_JIT_LIBS})
 
 
 add_llvm_library(LLVMIntelJITEvents

diff --git a/lib/Fuzzer/CMakeLists.txt b/lib/Fuzzer/CMakeLists.txt
index 5ba126e69ccd799b9265224e3436e2fce46a4ed8..f490b3681b9af10c025f49004baf81320452f02f 100644 (file)
--- a/lib/Fuzzer/CMakeLists.txt
+++ b/lib/Fuzzer/CMakeLists.txt
@@ -34,12 +34,12 @@ if( LLVM_USE_SANITIZE_COVERAGE )
   add_library(LLVMFuzzerNoMain STATIC
     $<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
     )
-  target_link_libraries(LLVMFuzzerNoMain ${PTHREAD_LIB})
+  target_link_libraries(LLVMFuzzerNoMain ${LLVM_PTHREAD_LIB})
   add_library(LLVMFuzzer STATIC
     FuzzerMain.cpp
     $<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
     )
-  target_link_libraries(LLVMFuzzer ${PTHREAD_LIB})
+  target_link_libraries(LLVMFuzzer ${LLVM_PTHREAD_LIB})
 
   if( LLVM_INCLUDE_TESTS )
     add_subdirectory(test)

diff --git a/lib/Support/CMakeLists.txt b/lib/Support/CMakeLists.txt
index 3301364cf2c6ad52849c40ff5832722f3aa8c4de..f7cfa760ba04cfcb689fa705b308c3579306e497 100644 (file)
--- a/lib/Support/CMakeLists.txt
+++ b/lib/Support/CMakeLists.txt
@@ -17,7 +17,7 @@ elseif( CMAKE_HOST_UNIX )
   if( LLVM_ENABLE_THREADS AND HAVE_LIBATOMIC )
     set(system_libs ${system_libs} atomic)
   endif()
-  set(system_libs ${system_libs} ${PTHREAD_LIB})
+  set(system_libs ${system_libs} ${LLVM_PTHREAD_LIB})
   if ( LLVM_ENABLE_ZLIB AND HAVE_LIBZ )
     set(system_libs ${system_libs} z)
   endif()

diff --git a/unittests/ExecutionEngine/Orc/CMakeLists.txt b/unittests/ExecutionEngine/Orc/CMakeLists.txt
index 68f6d0c28d7caab11fc85870de031dc2a6c6b13d..80c344e040a935e71dea834cbbe34cb0807fc2e8 100644 (file)
--- a/unittests/ExecutionEngine/Orc/CMakeLists.txt
+++ b/unittests/ExecutionEngine/Orc/CMakeLists.txt
@@ -21,4 +21,4 @@ add_llvm_unittest(OrcJITTests
   RPCUtilsTest.cpp
   )
 
-target_link_libraries(OrcJITTests ${PTHREAD_LIB})
+target_link_libraries(OrcJITTests ${LLVM_PTHREAD_LIB})

diff --git a/unittests/Support/CMakeLists.txt b/unittests/Support/CMakeLists.txt
index 4c9bb5eea38587f4d5dd9a9be34ca4cf19f4d1f3..ea260792282e9054d3adda52ee857febec31049a 100644 (file)
--- a/unittests/Support/CMakeLists.txt
+++ b/unittests/Support/CMakeLists.txt
@@ -64,4 +64,4 @@ add_llvm_unittest(SupportTests
   )
 
 # ManagedStatic.cpp uses <pthread>.
-target_link_libraries(SupportTests ${PTHREAD_LIB})
+target_link_libraries(SupportTests ${LLVM_PTHREAD_LIB})

diff --git a/utils/unittest/CMakeLists.txt b/utils/unittest/CMakeLists.txt
index a50733af9aae19064ec1d0794ba61d025cb1a630..b42ac834e3a77d5f661e92d655bb71ab4256de08 100644 (file)
--- a/utils/unittest/CMakeLists.txt
+++ b/utils/unittest/CMakeLists.txt
@@ -40,8 +40,8 @@ if (NOT LLVM_ENABLE_THREADS)
   add_definitions( -DGTEST_HAS_PTHREAD=0 )
 endif()
 
-find_library(PTHREAD_LIBRARY_PATH pthread)
-if (PTHREAD_LIBRARY_PATH)
+find_library(LLVM_PTHREAD_LIBRARY_PATH pthread)
+if (LLVM_PTHREAD_LIBRARY_PATH)
   list(APPEND LIBS pthread)
 endif()